David Blaine has admitted that his next stunt will be the hardest one he has ever performed.

The illusionist is planning to live in a human aquarium for a week, before attempting to break the world record for holding breath.

"I've been breaking my system down daily, so it's been tough. This hasn't been like the other ones. It's been out of control ridiculous," he is quoted by eecho.ie as saying.

"This has been the most rigorous training I've ever done, and it's harder than any stunt I've ever done and I haven't even done the stunt yet, so you can imagine."